When rectal cancer spreads out of the intestinal wall and infiltrates more extensively in the pelvis (or when it recurs in the pelvis after surgery), it can cause soreness and swelling in the lumbar and sacral areas. Invasive cervical cancer is often detected during gynecological examination and confirmed by pathological biopsy histological examination. Some cervical cancers are asymptomatic and seen abnormally by the naked eye, so pay attention to the differentiation. Dietary adjustment for more extensive infiltration in the pelvis due to rectal cancer: 1. Reduce energy intake: Energy intake is related to the occurrence of colorectal cancer. Most studies have shown that total energy intake is related to the risk of colorectal cancer, regardless of whether the energy intake is protein, fat or carbohydrate. Reducing energy intake has the potential to reduce the incidence of colorectal cancer. 2.Reducing fat and red meat intake: The occurrence of colorectal cancer is closely related to animal fat and meat, and some studies have shown that the risk of colorectal cancer is 3.26 times higher in high-fat consumers than in low-fat consumers. The intake of red meat is a strong risk factor for the occurrence of colorectal cancer. Reducing the fat content in food, especially minimizing brown meat after frying and roasting, can help reduce the chance of colorectal cancer. 3.Increasing fruits, vegetables and dietary fiber: Fiber can increase the amount of stool, dilute carcinogens in the colon and adsorb bile acid salts, which can reduce the occurrence of colorectal cancer. Epidemiological data show that the risk of colorectal cancer in those with the highest fruit and vegetable intake is only half of that in those with the lowest. Therefore, in the usual diet, we should try to consume more vegetables, fruits, fiber and reasonable diet to reduce the occurrence of colorectal cancer. 4.Vitamins and trace elements: Some studies have shown that supplemental vitamins A, C and E can transform the excessive proliferation of colonic epithelium in adenoma patients into normal, but the current information does not support the use of antioxidant vitamins to prevent colorectal cancer. Folic acid reduces the incidence of colorectal cancer, but the exact mechanism is not known. Another study found that increased calcium and magnesium intake may reduce the incidence of colorectal cancer, but the current study is not very detailed. 5, dietary anti-carcinogen: dietary garlic, onions, leeks, shallots containing thioether; citrus containing terpenes; grapes, strawberries, apples containing plant phenols and carrots, dioscorea, watermelon containing carotenoids, are believed to be able to inhibit mutations and have anti-cancer effects. Garlic, in particular, has been shown to be the vegetable with the strongest protective effect against distal colon cancer.